Random frequency accessible broad tunable THz-wave source using phase-matched DAST crystal DFG

2006 ◽  
Author(s):  
K. Suizu ◽  
A. Nawahara ◽  
T. Yamashita ◽  
H. Ito
Keyword(s):  
Wave Source ◽  
Thz Wave ◽  
Random Frequency

Random Frequency Accessible Broad Tunable Terahertz-Wave Source Using Phase-Matched 4-Dimethylamino-N-methyl-4-stilbazolium Tosylate Crystal

2007 ◽  
Vol 46 (11) ◽  
pp. 7321-7324 ◽  
Author(s):  
Hiromasa Ito ◽  
Koji Suizu ◽  
Tomoyu Yamashita ◽  
Akira Nawahara ◽  
Tomohisa Sato
Keyword(s):  
Terahertz Wave ◽  
Wave Source ◽  
Random Frequency

Semiconductor property imaging on as-grown wafer with monochromatic tunable THz-wave source

2018 ◽  
Vol 89 (7) ◽  
pp. 073701
Author(s):  
Akihide Hamano ◽  
Seigo Ohno ◽  
Hiroaki Minamide ◽  
Hiromasa Ito
Keyword(s):  
Wave Source ◽  
Thz Wave ◽  
Semiconductor Property

Incompleteness of General Relativity, Einstein's Errors, and Related Experiments-- American Physical Society March meeting, Z23 5, 2015 --

2015 ◽  
Vol 8 (2) ◽  
pp. 2135-2147 ◽  
Author(s):  
C. Y. Lo
Keyword(s):  
General Relativity ◽  
Einstein Equation ◽  
Reaction Force ◽  
Radiation Reaction ◽  
Gravitational Energy ◽  
Energy Conditions ◽  
Experimental Investigations ◽  
Positive Mass Theorem ◽  
Wave Source ◽  
Photonic Energy

General relativity is incomplete since it does not include the gravitational radiation reaction force and the interaction of gravitation with charged particles. General relativity is confusing because Einstein's covariance principle is invalid in physics. Moreover, there is no bounded dynamic solution for the Einstein equation. Thus, Gullstrand is right and the 1993 Nobel Prize for Physics press release is incorrect. Moreover, awards to Christodoulou reflect the blind faith toward Einstein and accumulated errors in mathematics. Note that the Einstein equation with an electromagnetic wave source has no valid solution unless a photonic energy-stress tensor with an anti-gravitational coupling is added. Thus, the photonic energy includes gravitational energy. The existence of anti-gravity coupling implies that the energy conditions in space-time singularity theorems of Hawking and Penrose cannot be satisfied, and thus are irrelevant. Also, the positive mass theorem of Yau and Schoen is misleading, though considered as an achievement by the Fields Medal. E = mc2 is invalid for the electromagnetic energy alone. The discovery of the charge-mass interaction establishes the need for unification of electromagnetism and gravitation and would explain many puzzles. Experimental investigations for further results are important.

Application Features of Pyroelectric Detector for THz Wave Receiving

2020 ◽  
Author(s):  
I.V. Kolenov ◽  
P.K. Nesterov ◽  
I.A. Nesterov ◽  
A.S. Lukash ◽  
V.I. Bezborodov ◽  
...  
Keyword(s):  
Pyroelectric Detector ◽  
Thz Wave

scholarly journals Lorentz force induced shear waves for magnetic resonance elastography applications

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Guillaume Flé ◽  
Guillaume Gilbert ◽  
Pol Grasland-Mongrain ◽  
Guy Cloutier
Keyword(s):  
Magnetic Resonance ◽  
Shear Wave ◽  
Lorentz Force ◽  
Wave Attenuation ◽  
Shear Waves ◽  
Estimation Method ◽  
Biological Tissues ◽  
Magnetic Resonance Elastography ◽  
Motion Generation ◽  
Wave Source

AbstractQuantitative mechanical properties of biological tissues can be mapped using the shear wave elastography technique. This technology has demonstrated a great potential in various organs but shows a limit due to wave attenuation in biological tissues. An option to overcome the inherent loss in shear wave magnitude along the propagation pathway may be to stimulate tissues closer to regions of interest using alternative motion generation techniques. The present study investigated the feasibility of generating shear waves by applying a Lorentz force directly to tissue mimicking samples for magnetic resonance elastography applications. This was done by combining an electrical current with the strong magnetic field of a clinical MRI scanner. The Local Frequency Estimation method was used to assess the real value of the shear modulus of tested phantoms from Lorentz force induced motion. Finite elements modeling of reported experiments showed a consistent behavior but featured wavelengths larger than measured ones. Results suggest the feasibility of a magnetic resonance elastography technique based on the Lorentz force to produce an shear wave source.

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